Ok, hope you all can help...
I have a 1995 Pathfinder v6/auto with 125k miles. When I got it, it ran a little rough and the guy said he thought it was the EGR valve. Not a problem. Read about pulling codes from the ECM and yep, code 32 - EGR function. Replaced the EGR and it was a little better but not really. Checked the codes again and it got (and still have) code 51 - Injector circuit. Read somewhere to let it idle and pull the injector leads one at a time until you disconnect an injector and it doesn't change the way it runs. I can reach 4 of them, the other 2 appear that I would have to remove the intake manifold to get at. The 4th one I disconnected didn't really change the way it ran as compared to the other 3. Not sure the way the cylinders are numbered, but it's the front injector for the drivers side. I ran some B12 through a tank of gas and for 100 or so miles it got better. A couple tanks later I put some Seafoam in just to see if anything would happen. Again, it got better for a little while. Now it's intermittent. Sometimes it runs great - smooth, sounds good, has noticeably more power, etc. Then while driving you can feel it kick out and the whole thing runs like poo again. A little later it starts working and so on.
So here's my question. I'm assuming I need to change an injector. Is there anything else it could be that I should check first? It looks like I have to remove a lot of stuff to get to the injectors. Any tips before I start? I've never changed injectors but it seems pretty straight forward and I'm not afraid to try it unless there's a good chance I could screw something up. I ordered 1 injector, can't really afford to change all 6. Can you test them to make sure I change the right one?
Thanks for the help.
Vince